A compact remote switch with a 2.6-foot (80 centimeter) cable to prevent
camera shake for super telephoto shots, macro photography, and bulb exposures.
Handy for taking pictures of subjects that are difficult to approach, or to
minimize vibration for close-ups and time exposure.
The remote switch works just like a shutter button, enabling halfway or complete
pressing. It also has a shutter-release lock. With the EOS-3's Custom Function
No. 12 (mirror lockup), camera shake can be further reduced.